:root{--brand:#4f46e5;--brand-dark:#4338ca;--bg:#f6f7fb;--card:#fff;--text:#111827;--muted:#6b7280;--border:#e5e7eb;--danger:#dc2626}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Inter,-apple-system,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text);min-height:100vh}.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:32px;box-shadow:0 1px 3px rgba(17,24,39,.06)}.btn{display:inline-block;width:100%;padding:11px 16px;background:var(--brand);color:#fff;border:none;border-radius:8px;font-size:15px;font-weight:600;cursor:pointer;transition:background .15s}.btn:hover{background:var(--brand-dark)}.btn:disabled{opacity:.6;cursor:wait}.field{width:100%;padding:11px 14px;border:1px solid var(--border);border-radius:8px;font-size:15px;outline:none;transition:border-color .15s,box-shadow .15s}.field:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(79,70,229,.12)}label{display:block;font-size:13px;font-weight:600;color:var(--muted);margin-bottom:6px}.error{background:#fef2f2;color:var(--danger);border:1px solid #fecaca;border-radius:8px;padding:10px 14px;font-size:14px}